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A big compressor doesn't mean max psi, just consistent psi that your fins can handle. Mine gets too weak, too fast. How many psi are you using? Maybe starting it up when the engine is cold and spraying the fins with water would rattle a bit loose??????

I would try some water, lightly at first, go easy if the fins seem prone to bending. Do you have a little compressor? Seems like a big one would do better, like a friend might have? My pancake compressor doesn't do it very well.